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Estimation of tropical cyclone parameters and wind fields from SAR images

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Science China Earth Sciences 2013年第2期56卷 1977-1987页

作者： zhou xuan YANG XiaoFeng LI ZiWei YU Yang BI HaiBo MA Sheng LI XiaoFeng State Key Laboratory of Remote Sensing Science Jointly Sponsored by Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University

The traditional method of Synthetic Aperture Radar(SAR)wind field retrieval is based on an empirical relation between the near surface winds and the normalized radar backscatter cross section to estimate wind speeds,where this relation is called the geophysical model function(GMF).However,the accuracy rapidly decreases due to the impact of rainfall on the measurement of SAR and the saturation of backscattered intensity under the condition of tropical *** of no available instrument synchronously monitoring rain rate on the satellite platform of SAR,we have to derive the precipitation of the SAR observation time from non-simultaneous passive microwave observations of rain in combination with geostationary IR images,and then use the model of rain correction to remove the impact of rain on SAR wind field *** the saturation of radar backscatter cross section in high wind speed conditions,we develop an approach to estimate tropical cyclone parameters and wind fields based on the improved Holland model and the SAR image features of tropical *** retrieve the low-to-moderate wind speed,the wind direction of tropical cyclone is estimated from the SAR image using wavelet *** then the maximum wind speed and the central pressure of tropical cyclone are calculated by a least square minimization of the difference between the improved Holland model and the low-to-moderate wind speed retrieved from *** addition,wind fields are estimated from the improved Holland model using the above-mentioned parameters of tropical cyclone as *** evaluate the accuracy of our approach,the SAR images of typhoon Aere,typhoon Khanun,and hurricane Ophelia are used to estimate tropical cyclone parameters and wind fields,which are compared with the best track data and reanalyzed wind fields of the Joint Typhoon Warning Center(JTWC)and the Hurricane Research Division(HRD).The results indicate that the tropical cyclone center,maximum wind speed,and central pr

关键词： rain correction tropical cyclone parameters wind fields estimate SAR

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Using Support Vector Machine to Predict Eco-environment Burden:A Case Study of Wuhan,Hubei Province,China

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Biomedical and Environmental Sciences 2008年第1期21卷 45-52页

作者： XIANG-MEI LI JING-xuan zhou SONG-HU YUAN XIN-PING zhou QIANG FU School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China China Environmental Monitoring Center Beijing 100029 China

Objective The human socio-economic development depends on the planet＇s natural capital. Humans have had a considerable impact on the earth, such as resources depression and environment deterioration. The objective of this study was to assess the impact of socio-economic development on the ecological environment of Wuhan, Hubei Province, China, during the general planning period 2006-2020. Methods Support vector machine （SVM） model was constructed to simulate the process of eco-economic system of Wuhan. Socio-economic factors of urban total ecological footprint （TEF） were selected by partial least squares （PLS） and leave-one-out cross validation （LOOCV）. Historical data of socio-economic factors as inputs, and corresponding historical data of TEF as target outputs, were presented to identify and validate the SVM model. When predicted input data after 2005 were presented to trained model as generalization sets, TEFs of 2005, 2006,…, till 2020 were simulated as output in succession. Results Up to 2020, the district would have suffered an accumulative TEF of 28.374 million gha, which was over 1.5 times that of 2004 and nearly 3 times that of 1988. The per capita EF would be up to 3.019 gha in 2020. Contusions The simulation indicated that although the increase rate of GDP would be restricted in a lower level during the general planning period, urban ecological environment burden could not respond to the socio-economic circumstances promptly. SVM provides tools for dynamic assessment of regional eco-environment. However, there still exist limitations and disadvantages in the model. We believe that the next logical step in deriving better dynamic models of ecosystem is to integrate SVM and other algorithms or technologies.

关键词： Urban eco-environment Total ecological footprint Support vector machine Partial least square

A Putative Chloroplast-Localized Ca2＋/H＋ Antiporter CCHA1 Is Involved in Calcium and pH Homeostasis and Required for PSII Function in Arabidopsis

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Molecular Plant 2016年第8期9卷 1183-1196页

作者： Chao Wang Weitao Xu Honglei Jin Taijie Zhang Jianbin Lai xuan zhou Shengchun Zhang Shengjie Liu Xuewu Duan Hongbin Wang Changlian Peng Chengwei Yang Guangdong Key Lab of Biotechnology for Plant Development College of Life Science South China Normal University Guangzhou 510631 China State Key Laboratory of Biocontrel and Guangdeng Key Laboratory of Plant Resources School of Life Sciences Sun Yat-sen University Guangzhou 510275 China Key Laboratory of Plant Resource Conservation and Sustainable Utilization South Ohina Botanical Garden Chinese Academy of Sciences Guangzheu Guangdong Province 510650 China

Calcium is important for chloroplast, not only in its photosynthetic but also nonphotosynthetic functions. Mul- tiple Ca2＋/H＋ transporters and channels have been described and studied in the plasma membrane and organ- elle membranes of plant cells; however, the molecular identity and physiological roles of chloroplast Ca2＋/H＋ antiporters have remained unknown. Here we report the identification and characterization of a member of the UPFO016 family, CCHA1 （a chloroplast-localized potential Ca2＋/H＋ antiporter）, in Arabidopsis thaliana. We observed that the ccha I mutant plants developed pale green leaves and showed severely stunted growth along with impaired photosystem II （PSII） function. CCHA1 localizes to the chloroplasts, and the levels of the PSII core subunits and the oxygen-evolving complex were significantly decreased in the ccha I mutants compared with the wild type. In high Ca2＋ concentrations, Arabidopsis CCHA1 partially rescued the growth defect of yeast gdtl3 null mutant, which is defective in a Ca2＋/H＋ antiporter. The cchal mutant plants also showed significant sensitivity to high concentrations of CaCI2 and MnCI2, as well as variation in pH. Taken these results together, we propose that CCHA 1 might encode a putative chloroplast-localized Ca2＋/H＋ antiporter with critical functions in the regulation of PSII and in chloroplast Ca2＋ and pH homeostasis in Arabidopsis.

关键词： Ca2+/H+ antiporter Ca2+ homeostasis pH homeostasis CCHA1

大跨度屋盖结构考虑模态耦合的抖振共振响应分析方法

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振动工程学报 2006年第2期19卷 179-183页

作者：周晅毅顾明同济大学土木工程防灾国家重点实验室上海200092

提出了可考虑模态耦合效应的共振响应分量近似形式,并基于此得出用于计算风振响应共振分量的修正SRSS法。最后将该方法运用于上海南站工程屋面结构的共振响应分析以检验其正确性及精度。本方法为进一步建立复杂大跨度屋盖结构等效静力... 详细信息

提出了可考虑模态耦合效应的共振响应分量近似形式,并基于此得出用于计算风振响应共振分量的修正SRSS法。最后将该方法运用于上海南站工程屋面结构的共振响应分析以检验其正确性及精度。本方法为进一步建立复杂大跨度屋盖结构等效静力风荷载方法奠定了基础。

关键词：风荷载大跨度屋盖结构共振响应模态耦合修正SRSS法

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基于改进长短时记忆网络的地面空调能耗预测

北京航空航天大学学报 2023年第10期49卷 2750-2760页

作者：周璇林家泉中国民航大学电子信息与自动化学院天津300300

在机场运行管理中,地面空调是对飞机客舱进行降温除湿的主要设备,准确预测出其在工作过程中的耗电量对于建设绿色机场具有重要意义。地面空调能耗受多维因素的影响,为提高预测精度,提出一种基于改进双向长短时记忆(BiLSTM)神经网络的飞... 详细信息

在机场运行管理中,地面空调是对飞机客舱进行降温除湿的主要设备,准确预测出其在工作过程中的耗电量对于建设绿色机场具有重要意义。地面空调能耗受多维因素的影响,为提高预测精度,提出一种基于改进双向长短时记忆(BiLSTM)神经网络的飞机地面空调能耗预测方法。所提方法使用BiLSTM神经网络和注意力机制构造模型的预测部分,可以充分挖掘和利用数据中的时间序列特征;并以预测精度最优为指标,提出一种基于改进蚁狮优化(IALO)算法的超参数优化算法,与标准蚁狮优化算法相比,改进蚁狮优化算法在随机游走空间缩小机制中改进了收缩因子并赋予收缩系数一定的随机性,同时引入普通蚁狮权重系数动态调整机制,提高所提算法的收敛速度及寻优能力。在实际数据集上进行仿真可知,所提方法预测结果的均方误差为6.045,平均绝对百分比误差为0.928%,决定系数为0.956。通过与其他多种预测方法比较,充分证明所提方法具有准确度高、适应性强等优点。

关键词：地面空调能耗预测双向长短时记忆神经网络注意力机制蚁狮优化

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CD97 inhibits osteoclast differentiation via Rap1a/ERK pathway under compression

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International Journal of Oral Science 2024年第1期16卷 134-144页

作者： xuan zhou Xinjia Cai Fengyang Jing Xuefen Li Jianyun Zhang Heyu Zhang Tiejun Li Department of Oral Pathology Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijingChina Research Unit of Precision Pathologic Diagnosis in Tumors of the Oral and Maxillofacial Regions Chinese Academy of Medical Sciences(2019RU034)BeijingChina Central Laboratory Peking University School and Hospital of StomatologyBeijingChina

Acceleration of tooth movement during orthodontic treatment is challenging, with osteoclast-mediated bone resorption on the compressive side being the rate-limiting step. Recent studies have demonstrated that mechanoreceptors on the surface of monocytes/macrophages, especially adhesion G protein-coupled receptors (aGPCRs), play important roles in force ***, its role in the regulation of osteoclast differentiation remains unclear. Herein, through single-cell analysis, we revealed that CD97, a novel mechanosensitive aGPCR, was expressed in macrophages. Compression upregulated CD97 expression and inhibited osteoclast differentiation;while knockdown of CD97 partially rescued osteoclast differentiation. It suggests that CD97 may be an important mechanosensitive receptor during osteoclast differentiation. RNA sequencing analysis showed that the Rap1a/ERK signalling pathway mediates the effects of CD97 on osteoclast differentiation under compression. Consistently, we clarified that administration of the Rap1a inhibitor GGTI298 increased osteoclast activity, thereby accelerating tooth movement. In conclusion,our results indicate that CD97 suppresses osteoclast differentiation through the Rap1a/ERK signalling pathway under orthodontic compressive force.

关键词： CD97 osteoclast inhibited

From Perspective of Hippocampal Plasticity:Function of Antidepressant Chinese Medicine Xiaoyaosan

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Chinese Journal of Integrative Medicine 2024年第8期30卷 747-758页

作者： ZHANG Wu-jing GUO Ze-xuan WANG Yi-di FANG Shao-yi WAN Chun-miao YU Xiao-long GUO Xiao-fang CHEN Yue-yue zhou xuan HUANG Jun-qing LI Xiao-juan CHEN Jia-xu FAN Li-li Guangzhou Key Laboratory of Formula-Pattern of Traditional Chinese Medicine School of Traditional Chinese MedicineJinan UniversityGuangzhou510632China

The hippocampus is one of the most commonly studied brain regions in the context of *** volume of the hippocampus is significantly reduced in patients with depression,which severely disrupts hippocampal ***,antidepressant therapies that target hippocampal neuroplasticity have not been identified as *** medicine(CM)can slow the progression of depression,potentially by modulating hippocampal ***(XYS)is a CM formula that has been clinically used for the treatment of *** is known to protect Gan(Liver)and Pi(Spleen)function,and may exert its antidepressant effects by regulating hippocampal *** this review,we have summarized the association between depression and aberrant hippocampal ***,we have discussed the researches published in the last 30 years on the effects of XYS on hippocampal neuroplasticity in order to elucidate the possible mechanisms underlying its therapeutic action against *** results of this review can aid future research on XYS for the treatment of depression.

关键词： depression hippocampal neuroplasticity Xiaoyaosan Chinese medicine

Detection of infectious dengue virus by selective real-time quantitative polymerase chain reaction

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Virologica Sinica 2016年第4期31卷 342-345页

作者： Xin Huang xuan zhou Xiaoyan He Pei Wang Shuai Yue Lixin Wu Yu Zhang Qian Xie Bao Zhang Wei Zhao Guangdong Provincial Key Laboratory of Tropical Disease Research School of Publice HeathSouthern Medical UniversityGuangzhou 510515China Second clinical medical coellge Southern Medical UniversityGuangzhou 510280China Nanfang Hospital Southern Medical UniversityGuangzhou 510515China

Dear Editor,The dengue virus(DENV)is a single-stranded positivesense RNA virus that belongs to the family Flaviviridae(Gubler,2002),and has four serotypes,DENV1–DENV4,which are transmitted via Aedes aegypti and Aedes albopictus(Rodriguez-Roche and Gould,2013).It has been reported that more than 50 million dengue infections occur each year(Guzman et al.,2010),and a serious outbreak occurred in the Southern Provinces

关键词： PCR time real

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摹状词理论:从语义到语用

外语学刊 2014年第4期 6-11页

作者：周璇黑龙江大学哈尔滨150080

罗素用摹状词理论对传统逻辑中主谓式的语句进行语义分析,力图将其逻辑结构清晰呈现出来,从而解决哲学和逻辑学中诸多疑难,而斯特劳森从语用层面上批判罗素的这种转化工作。此批判强调语境要求对于语词和语句使用的影响,在一定程度上促... 详细信息

罗素用摹状词理论对传统逻辑中主谓式的语句进行语义分析,力图将其逻辑结构清晰呈现出来,从而解决哲学和逻辑学中诸多疑难,而斯特劳森从语用层面上批判罗素的这种转化工作。此批判强调语境要求对于语词和语句使用的影响,在一定程度上促成摹状词理论从语义向语用的转变。本文一方面通过斯特劳森的批判,再现这种转变,另一方面也希望对罗素与斯特劳森的思想展开质疑与反质疑的哲学思考。

关键词：斯特劳森罗素摹状词理论语境